Modularizing Neutron plays for agents and non ml2 plugin support

date:2015-09-09 18:00
tags:neutron, plugins, agents

This spec is propsed to enhance the current neutron playbooks that take a static approach to plugin and agent insertion. Where ml2 and a few agents are used by default.

Problem Description

Presently a straightforward approach does not exist to add new plugins and add / remove agents to the neutron setup. A deployer either has to perform these changes after the whole setup is complete or make their own changes in the playbooks locally. This feature has already been implemented in juno branch.

Proposed Change

The files in playbooks/roles/os_neutron/tasks will be modified, particularly neutron_pre_install.yml and neutron_post_install.yml. Addition of new parameters will be made to playbooks/roles/os_neutron/defaults/main.yml

Playbook Impact

The following playbooks are expected to be modified to support this feature:

  • playbooks/roles/os_neutron/defaults/main.yml
  • playbooks/roles/os_neutron/tasks/main.yml
  • playbooks/roles/os_neutron/tasks/neutron_pre_install.yml
  • playbooks/roles/os_neutron/tasks/neutron_post_install.yml

Upgrade Impact

None

Alternatives

Using the current architecture, prospective new core plugins which are not ml2 will have to take an overwriting the default configuration, after its done, approach to insert their own changes.

Security Impact

None known at this time.

Performance Impact

This change is not expected to impact performance. Installing the default set of agents and plugins as done now, will take the same amount of effort.

End User Impact

This is not expected to impact end users as it deals with the deployment aspect only.

Deployer Impact

This will introduce a more modular architecture for deployers to select neutron plugins/agents from, allowing a wider use case for the OSAD playbooks.

Developer Impact

Using the default values will require no new developer effort, only those interested in changing the neutron config will be effected.

Dependencies

N/A

Implementation

Assignee(s)

Primary assignee:
https://launchpad.net/~javeria-ak javeriak

Work items

This change will include modifying the existing os_neutron role to pick up what plugin to install along with what agents. The names and configs for individual plugins will be created as new variables in playbooks/roles/os_neutron/defaults/main.yml

Dependencies

N/A

Testing

There are no additional changes required to test this in the current testing and or gating framework.

Documentation Impact

A bit of additional documentation describing how to insert new plugins/agents will be required. This will be deployer documentation.